A underground hacker from Russia with handle ‘fil9” posted a zero day android exploit for sale. (screenshot below)

This zero day exploit works on Firefox 23/24/26 as claimed by the author. Joshua from Malwarebytes spotted this advertisement on Inj3ct0r, an exploit database, where the author was selling the zero day for $460 Us dollars.

As per Malware bytesThe exploit forces the mobile browser to download and execute a (possibly) malicious app.

fil9 shows the exploit in action, downloading and installing what appears to be an update for Firefox. However, when the “update” is executed automatically, viewers can see the potential for malicious code to be inserted.”

However the user must allow installation of the app from an unknown source, which is typically not a recommended policy.

“The biggest problem in this situation is that Firefox automatically executes certain known files once they’re downloaded, and doesn’t give users an option to disable this. Without some sort of prompt, users have no idea that an external app has just been executed.” as explained by Malwarebytes.